%0 Journal Article
%A D. Safarov
%T Periodic solutions of first-order elliptic systems
%J Differencialʹnye uravneniâ
%D 1981
%P 1468-1477
%V 17
%N 8
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1981_17_8_a10/
%G ru
%F DE_1981_17_8_a10